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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9335494cea0e0990c159b1625641bd4375575da34744ed917649bbf02dd181fc' 
  AND token = 'gXK3rAsBDk0odmmUjuRMaV4p75qufXh2zDbql5K7Ih8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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