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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1afc521c6a678f72c5f90851e562431918bca4a0bdcdf8aa57dcf19ee97aa83a' 
  AND token = 'FhN9IEIj5DtNbAqaTxNGTNjF5N8RMC8bsaCh5Oyqfno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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