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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7c1f4600e7bf92c999dead57b680698504ef02454d9273433be47c1d71a3a3e' 
  AND token = '7cXRpaeGRdQkxnOHHVxGhRDet6hrTgsBTp3lcM3wDls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00272

JSON explain

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