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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb9cc5a442c7b0ed900ee7c6ccd4e28a57c3568939493fd370977a507b6dc8e3' 
  AND token = 'L44S2JUW8ZA7ndB+S7kVouriDa6hdbEnaoUKV99Ok5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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