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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25ec8aaea43a1b759c79551ac435faf32c4a2122e5b0156c478534138607759b' 
  AND token = 'HxZtT4aUWnQQW+uoO7BtterWW3llXbeIQ/pEkjxvz5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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