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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea0c7317333c76acff0e4103842362eb97c378dc8bf20e925fe9461e827b964c' 
  AND token = 'GY2+fq+zqSun26iD17QwW6SPsWDNJnV64l8sahxaUe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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