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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ae4bb2fb580c569e6afcd962aac22ed59c1d892fec1b0e515e7601e57bbaee7' 
  AND token = 'UXo6G3d7wtq708R6GgsEil7mrtShy7KnleKP9u7nT1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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