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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3656845cacd9c285933f5c7ab7aadb60791ee3c03f8e4d0a922cde6951b7c663' 
  AND token = '8QfvR7JFseZonW2Rj2TSG9I4soh8X3BqnrlhJ5Y2L9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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