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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '599990569d71ae6f6e4fbb7b54673d7f866fe386a5b78e8d659d67a11e3f9213' 
  AND token = 'fHr91Ff1g/r0EKnh9UL9ikLFn26XZeOOHrYRKD8KLr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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