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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c934d07004aabdcd24a6ce9944371107b6af13bf5c84a4a1ef451c4811bd783' 
  AND token = 'SmToYbQ2OtwCM6z2PkG537khTiqjP4HIlrlF+bpWQL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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