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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f92e44f9b8c8f64b40a06becb37ea40ec56056bd4c2bcf071b603f9c419d83c' 
  AND token = '7GX01p9HJPfbPbFHBc4UVbE7rQdkVuoKM8kQc6Hy/Tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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