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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ab26d4a577b2420e7fc1fea736963e09e222616b97f666e6037b767ed8350c9' 
  AND token = '8Q/hZmMy0y1Xddy7VXRZQPpT6lYvTp0is9TsjCowMkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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