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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5923dbce97d4dfb3eaa953a79c0c1696a89d904d36119b32c010eaa1abed1239' 
  AND token = 'muCZ8DaSHeL4c/+RcGtukuRKmL9Lbo7J7ryiAOSG+J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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