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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9a0f8950c6e09b44c4043da442acbd0b58f5abc56e526e421b599d8ebd22db2' 
  AND token = 'oUqZJxbQyRo6ZHM1XD1QBQmYhf0WwuHo38KjADZMtGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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