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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf6e0ba6bbdb8bb6ce99ab5f20e1027506739cf9bb44edb11a9cd7d71451de04' 
  AND token = 'yvoqJi2TVSY6ANicR5HdhP2fqEp6wbQPNGZ+qpIfHEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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