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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d4f94c060a90ed4fbe6c2cb18385975a3af5138401afaef0065c555b0b89071' 
  AND token = 'hB9Lyg1GgJpjkd913k4O3jAtHaG33eVHZ+r1sAUxF4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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