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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '057b5c290c88dd3d429731e698c4c48480b93f5652f45ec771953de8026f950d' 
  AND token = 'JV5Aofb1700D20Oj4+Gv0Tm/hbpxDnwlWxBgff4uosM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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