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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '173f03e8df2a3687d060229b027a8c756e644d77fda4c7ac30f916050178d728' 
  AND token = 'I2oA06y5f8AVV2Knksy3eMHsydTXD9mZOZTgLYrJ70M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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