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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b0bdb7983372b3776dc33f11795871daf1a2a4196f08744b90fd0e9a30ebda5' 
  AND token = '4CjAkeCuU+eDHdApDWv30a91okCGVo3rOFZdtVxrLv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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