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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbc2e3e5d774ff506418e1a276cebeacf6e18e783840b5d433243873a4ce625e' 
  AND token = '+cDCQ1e6TPJXAVQeYRG2+2H+AFKZ+wcMMlWYCX/objU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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