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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e11dc8b45bc43c1ed8f005f9ca584f0554344b4007fe13abdd050c017602f8a1' 
  AND token = '2tigT8dbH9Cz+c4chHAdeUFwYilkFGCm6a/NblMvw4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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