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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee9ab566af6a5e47db0f5550fb7e97dfdfeb2eaed9132a8c3d03fb8bc9c55bc0' 
  AND token = 'tNJpmhlQ1TYJ+W/2CG6hDNPslngHJa1ryEl8R38FEnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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