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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7561a2b4b9543e23c50c19cf2fa6e813f5dc714f32e57f636ce2fd1626af2354' 
  AND token = 'oseuk65obsY8cRPTNs0/R0DmPJKej0Rvn0Q5z/aaGQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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