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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a06a837331f66d6b5e5016efc99f08c6ec613d1af82afbc76323433a117846c' 
  AND token = 'XCWDTl1kgjjvpY3LpujYiJTyynJGBPcy/8CGq6Q3X+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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