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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20ae5c846be2c11ecd838798ae086782c81d4f0cb3d96cf63e3fed0d68074008' 
  AND token = 'CeDbGkX2ri89Q7OdQV52/NOg6D17jGOqL4vij6uJNn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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