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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c01db34a4f4c5de47b57c8b276507133a172ba5ffab73800549f9f009a0c6ab0' 
  AND token = 'vzSZ8pDIPJGhlWAFBwx+Roe88v6m8ok+p9y61BrlW+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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