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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68acd348d04fe48682f64093b40acb3e937a47a01eb33e07a54767761c077237' 
  AND token = '8cnGjeZkTWz7dABXksNww8+gFwYmjVcV8SbeSkBzZj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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