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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a3f8bb18e520b6f1dbcdd2dc046971c7b0a4828f4d6f3a61eeb4efa80810b01' 
  AND token = 'pWYrD2oSNWlOQHqx/Esy+rns/rQLLXyMGRUy2DjFdGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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