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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb768d38a98acf918f527a5b6a7265f223960fd9ee267dcc6e61bb01a20d7562' 
  AND token = 'fJXbQUth6rBmBQO1ik/gU5u7PUlr3XBsCyRfe7pEC2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00138

JSON explain

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