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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8358b11425f01c1de0bb2c0de39790a09b2592c79dcadb3bed6abccc22d19c3d' 
  AND token = 'N/wU5nZM65JoWeYlInJ754mm6hpTo6qHG3Rpm31HEBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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