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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9825d48c1d10840abdab377c382e77c1bed22ba27d8dfca5d0e467baf0868b1b' 
  AND token = 'NThhDXv49/qedKqx82dE61AwdgvsW2HRHK72Ut6064Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}