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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd111a5e1be11afcdfc33e7c6e1d39a66d622c832e8c46274b37a278ccb096de3' 
  AND token = '0ktRBd5AyE16iWFHvd1S6la4O7ymEuGv4qKgYXwbO2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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