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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db2a5145fe3da61036e73722afc055829548e5150bb02e90f5927cdd9257d090' 
  AND token = 'unvKbesH4hqoB9boZ9pipYIV7TE7Moi42AjGqI93Dh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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