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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed299ee1ae5684dcd1269306d6bf0130e0e8d93493d48eda947753196ac7cb7a' 
  AND token = 'TIqZf6yT67HERXpeLWRnDqvVO2apMXqlPnRMu+exw+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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