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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f057b4778cfdf98799a733a76346e8afc6902b5e4897ec1457887577f295f2b5' 
  AND token = 'AG2g0jEpUEZ5ibwU039XfDSwZXqqfv7GQilpMIAXBJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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