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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da8bc27f9b6bfb7863c1fe31a204cfd6614c40e73503da8bcc70cb99e567eb59' 
  AND token = 'd787h/elVkKVx0H24G7AYA/Ff3irQVzIfQ0aWNm6JUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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