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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8d131b228ebebabfeb87d1f43bf25e441465975705e9648848f2f58aa4177ca' 
  AND token = 'g5S+MW85x8AP6DYoghQU2srUK57fuEOoBvI4Se2c8yE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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