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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '643d1ba9bc1472dae9d6efbf77ef6bfe706ba0d89ba5d77dfa626b18efa1660a' 
  AND token = 'KVuhIdhO9M6iPA/5K4YMuX0lXi+wi2mxp9WCmfwidTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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