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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c60a7bbc8adabd5d30a412c5596acf4a25d1c94e177d799a7193f717db891afb' 
  AND token = 'i7126CngScnFkugddVM52vQeqA3oUs55+p5+RuJFE0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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