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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d3e6f156c5eaabfecf7ac60eb545278afed0a3c8c3ce0bfcff9910b9e13d718' 
  AND token = '9UP31GPKnxtLfj8oqRbr4AiV7guIMNUcQbL7rV0U+IA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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