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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c20c0f643e4f60e49fb4446c6a2cd24fa744c06741c5b5167c4c634930cbe175' 
  AND token = 'Zru7NLUFrClS3cXynLyTuRzRgrWCBPL0BgYj8S4dggs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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