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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eec9ce66a66036c2708547494f6a4d64032d16dc44ebf259ad4a7d0b72e2988d' 
  AND token = 'A19FrHav6U18I5PTqzJ52iRUVu8KI1Mh/BH5ck2knFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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