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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beb2227936a18ffa711a385f28a60c640529f122c89b4e47a2f4f99a2533be54' 
  AND token = 'xpOBBO0aoOsOmwZbR5xDK+gakK6KC3lv8Vnv3p2ow4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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