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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b5c952e15cd78ae56a9bef3fb9b82731dc8f6b6a53cef14e7a0711e5dfb7ba' 
  AND token = '+e7WoQWH0ZWzz1mnnYU8OhRGYU0N2OFdG/W7TejAYSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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