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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a93c0cdad6e94e965ed8fab581006654dfc8b0d5e58a42898800f723a58e5d4d' 
  AND token = 'elbtaW2c6eJMyZKXPYGfLk81kR/RpA7TpQ1as98y/5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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