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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23a5b73948b95fc9aed201ef725d7a05c260f4450a579dd1a4ec5422ef20b1b9' 
  AND token = 'sMQfQTqCiXX7J778LLZ9Vv49XQxsxJuqFySzZFyjrmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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