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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa52f9c36a479570b8148495ff9522e1aadc045e6af754ea86fe6faaf89dafc5' 
  AND token = '/cn3sqDisa0hnQNAe/xYIPHzz6KEo9mjDPrb9sGAngA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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