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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd81d5ef9d4a49b02bc9ec9e0ad1b92ab4c7acfc0695b692c80a840af394c74e' 
  AND token = 'w7a7yCQVNSV4Z8fcJ9fSGilXFHrsjstprupCyCGPqxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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